Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 383.4	$ 362.5
Life, accident and health earned premiums, net	28.6	29.9
Net investment income	51.9	51.1
Net realized and unrealized gains (losses) on investments	(19.1)	5.5
Net revenue	444.8	449.0
Operating expenses
Cost of revenue	346.1	324.5
Policy benefits, changes in reserves, and commissions	72.4	52.7
Selling, general and administrative	52.3	46.9
Depreciation and amortization	0.6	0.3
Other operating income	0.2	(1.0)
Total operating expenses	471.6	423.4
Income (loss) from operations	(26.8)	25.6
Interest expense	(21.3)	(18.8)
Loss on early extinguishment or restructuring of debt	(5.8)	0.0
Other income, net	2.8	3.4
Loss from equity investees	(2.5)	(5.9)
(Loss) income from continuing operations before income taxes	(53.6)	4.3
Income tax benefit (expense)	12.6	(4.0)
(Loss) income from continuing operations	(41.0)	0.3
Less: Loss from discontinued operations, net of tax	(60.0)	(6.6)
Net loss	(101.0)	(6.3)
Net loss attributable to noncontrolling interest and redeemable noncontrolling interest	17.9	3.5
Net loss attributable to HC2 Holdings, Inc.	(83.1)	(2.8)
Less: Preferred dividends, deemed dividends and repurchase gains	0.4	(1.2)
Net loss attributable to common stock and participating preferred stockholders	$ (83.5)	$ (1.6)
(Loss) income per share - continuing operations
Net (loss) income attributable to continuing operations - basic (in usd per share)	$ (0.85)	$ 0.08
Net (loss) income attributable to continuing operations - diluted (in usd per share)	(0.85)	0.04
Loss per share - discontinued operations
Basic (in usd per share)	(0.97)	(0.12)
Diluted (in usd per share)	(0.97)	(0.09)
Loss per share - Net loss attributable to common stock and participating preferred stockholders
Basic (in usd per share)	(1.82)	(0.03)
Diluted (in usd per share)	$ (1.82)	$ (0.05)
Weighted average common shares outstanding:
Basic (in shares)	45.9	44.8
Diluted (in shares)	45.9	59.7